Experimental and numerical investigations of the effects of bundled conductor on seismic responses of interconnected electrical equipment

IF 2.8 3区工程技术 Q2 MECHANICS

International Journal of Non-Linear Mechanics Pub Date : 2024-11-15 DOI:10.1016/j.ijnonlinmec.2024.104956

Chang He , Yanyan Guo , Chengwei Zhou , Wang Zhu , Lizhong Jiang

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引用次数: 0

Abstract

With a main function of power transmission, bundled conductors bring in strong nonlinearity for the connected electrical equipment in substations. Investigations of their effects on seismic responses of interconnected electrical equipment (IEEQ) are few in literature, lacking studies from an experimental perspective. Thus, shaking table tests were performed on a scaled ultra-high voltage IEEQ. The tests examine the effects of slackness, bending stiffness, number of spacers, and damping of the bundled conductors. Besides, the influence of earthquake input directions is also analysed. Moreover, a numerical model is developed to conduct parameter analyses to investigate the influence of bundled spacing and equipment frequency. The results indicate that the connection of the conductors reduces the IEEQ relative displacement. It overall increases the stress responses of the higher-frequency equipment while reduces those of the low-frequency equipment. The effects of slackness are related to the damping and stiffness effects of bundled conductors, since the latter can decrease the seismic responses of the IEEQ. Besides, the effects of bundled conductors on the out-of-plane and vertical responses of the IEEQ can be neglected per the test results. Finally, bundled conductors may twist during earthquakes, the spacers thereby should be positioned appropriately to prevent this issue.

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捆绑导体对互连电气设备地震响应影响的实验和数值研究

捆绑导线的主要功能是输电，因此会给变电站中的连接电气设备带来很强的非线性。有关其对互连电气设备（IEEQ）地震响应影响的研究文献很少，缺乏从实验角度进行的研究。因此，对按比例缩放的超高压 IEEQ 进行了振动台试验。试验研究了捆绑导体的松弛度、弯曲刚度、间隔数和阻尼的影响。此外，还分析了地震输入方向的影响。此外，还开发了一个数值模型来进行参数分析，以研究捆绑间距和设备频率的影响。结果表明，导体的连接降低了 IEEQ 的相对位移。总体而言，它增加了高频设备的应力响应，同时降低了低频设备的应力响应。松弛效应与捆绑导体的阻尼和刚度效应有关，因为后者可降低 IEEQ 的地震响应。此外，根据测试结果，可以忽略捆绑导体对 IEEQ 平面外和垂直响应的影响。最后，捆绑导体在地震中可能会扭曲，因此应适当放置间隔物以防止出现这一问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Non-Linear Mechanics 物理-力学

CiteScore

5.50

自引率

9.40%

发文量

192

审稿时长

67 days

期刊介绍： The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.